Tectonic signatures in carbonate platform sequences and diagenesis proximal and distal to convergent margins

目前关于碳酸盐岩台地系统的知识主要来自构造相对稳定的地质环境，如沿着大陆后缘、远离会聚边缘的前陆盆地内部以及板块内部的海洋台地。拟议的研究将调查的沉积稳定性，地层几何形状和成岩作用的碳酸盐岩平台，以响应当地和区域构造。两个地质区域允许研究距离会聚（俯冲）板块边界不同距离的构造特征。(1)在加拿大中部（安大略东南部），一个晚奥陶世（4.5亿年）碳酸盐台地覆盖在一个区域性（200公里长）断层系统上，该断层系统位于地下，埋藏较浅（* 研究成果将引起全球地质界的兴趣。这项研究将扩大目前对碳酸盐沉积体系构造敏感性的有限认识，并对比碰撞板块边界近端和远端位置的台地结构。这项研究将有助于描述从会聚边界进入板块内部的沉积不稳定性的潜在构造梯度，并解决继承结构的重新激活对年轻沉积体系中地层模式的影响。将通过地质会议和同行评审期刊（国家、国际）传播成果。社区一级将对安大略省的项目感兴趣，因为古老的断层系统位于许多农村和城市社区的下面，并毗邻活跃的西部魁北克地震带。这种接近性强调了潜在的断层复活是现代而不仅仅是古代的地质后果。

The current state of knowledge about carbonate platform systems is dominated by modern and ancient examples from relatively tectonically stable geologic settings such as found along continental trailing margins; in the interior of foreland basins distant from convergent margins; and, on oceanic platforms within plate interiors. The proposed study will investigate the depositional stability, stratigraphic geometry, and diagenesis of carbonate platforms in response to local and regional tectonism. Two geologic regions allow study of tectonic signatures at different distances from convergent (subducting) plate boundaries. (1) In central Canada (SE Ontario), a Late Ordovician (450 million years) carbonate platform overlies a regional (200 km long) fault system within the underlying and shallowly buried (*Research outcomes will be of interest to the global geological community. The research will expand on the current limited knowledge about tectonic sensitivity of carbonate depositional systems, and contrasting platform architecture in proximal to distal positions from collisional plate boundaries. The study will help characterize a potential tectonic gradient of depositional instability directed into the plate interior from convergent boundaries, and address the impact of reactivation of inherited structure on stratigraphic patterns in younger sedimentary systems. Dispersal of results will be through geological conferences and peer-reviewed journals (national, international). There will be community-level interest in the Ontario-based project because the ancient fault system underlies many rural and urban communities, and lies adjacent to the active Western Quebec Seismic Zone. Such proximity underscores potential fault reactivation as a modern, not just ancient, geological consequence.**